Risk Management and Fair Values Fair Values Of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Utility [Member]
Liabilities:
Letters of Credit Outstanding, Amount	$ 3.0
Entergy Wholesale Commodities [Member]
Liabilities:
Cash collateral posted	8.0	$ 8.0
Prepayments And Other [Member] \| Natural Gas Swaps [Member] \| Utility [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	13.0	6.0
Derivative asset as hedging instrument offset		0.0
Derivative Asset	13.0	6.0
Prepayments And Other [Member] \| Financial Transmission Rights (FTRs) [Member] \| Utility and Entergy Wholesale Commodities [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	21.0	4.0
Derivative asset as hedging instrument offset	(2.0)	0.0
Derivative Asset	19.0	4.0
Other Deferred Debits And Other Assets [Member] \| Natural Gas Swaps [Member] \| Utility [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	3.0	5.0
Derivative asset as hedging instrument offset		0.0
Derivative Asset	3.0	5.0
Other Current Liabilities [Member] \| Natural Gas Swaps [Member] \| Utility [Member] \| Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	25.0	7.0
Derivative liability as hedging instrument offset	0.0
Derivative Liability	25.0	7.0
Derivative Liability, Fair Value, Gross Liability	25.0	7.0
Entergy Louisiana [Member] \| Prepayments And Other [Member] \| Natural Gas Swaps [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	13.1	5.7
Derivative asset as hedging instrument offset	0.0	0.0
Derivative Asset	13.1	5.7
Entergy Louisiana [Member] \| Prepayments And Other [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	7.7	0.6
Derivative asset as hedging instrument offset	0.4	0.0
Derivative Asset	7.3	0.6
Entergy Louisiana [Member] \| Other Deferred Debits And Other Assets [Member] \| Natural Gas Swaps [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	3.4	5.3
Derivative asset as hedging instrument offset	0.0	0.0
Derivative Asset	3.4	5.3
Entergy Arkansas [Member] \| Prepayments And Other [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	10.3	2.3
Derivative asset as hedging instrument offset	0.0	0.0
Derivative Asset	10.3	2.3
Entergy Mississippi [Member] \| Financial Transmission Rights (FTRs) [Member]
Liabilities:
Letters of Credit Outstanding, Amount	0.2	0.2
Entergy Mississippi [Member] \| Prepayments And Other [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	0.6	0.3
Derivative asset as hedging instrument offset	0.0	0.0
Derivative Asset	0.6	0.3
Entergy Mississippi [Member] \| Other Current Liabilities [Member] \| Natural Gas Swaps [Member] \| Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	24.0	6.7
Derivative liability as hedging instrument offset	0.0	0.0
Derivative Liability	24.0	6.7
Derivative Liability, Fair Value, Gross Liability	24.0	6.7
Entergy New Orleans [Member] \| Financial Transmission Rights (FTRs) [Member]
Liabilities:
Letters of Credit Outstanding, Amount	0.2
Entergy New Orleans [Member] \| Prepayments And Other [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	0.8	0.1
Derivative asset as hedging instrument offset	0.0	0.0
Derivative Asset	0.8	0.1
Entergy New Orleans [Member] \| Other Current Liabilities [Member] \| Natural Gas Swaps [Member] \| Not Designated As Hedging Instrument [Member]
Liabilities:
Derivative Liability, Fair Value, Gross Liability	1.5	0.5
Derivative liability as hedging instrument offset	0.0	0.0
Derivative Liability	1.5	0.5
Derivative Liability, Fair Value, Gross Liability	1.5	0.5
Entergy Texas [Member] \| Financial Transmission Rights (FTRs) [Member]
Liabilities:
Letters of Credit Outstanding, Amount	2.4	0.1
Entergy Texas [Member] \| Prepayments And Other [Member] \| Financial Transmission Rights (FTRs) [Member] \| Not Designated As Hedging Instrument [Member]
Assets:
Derivative asset, fair value	1.2	0.8
Derivative asset as hedging instrument offset	1.1	0.0
Derivative Asset	$ 0.1	$ 0.8

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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